// Copyright (c) 2026 Gordon Bolton. MIT License.
/**
 * Unit tests for the pure helper functions defined inside server/routes/dashboard.js.
 *
 * Because these helpers are not exported, we re-implement them verbatim here so
 * that a future refactor that exports them can simply swap the import.  The logic
 * under test is the business-critical matching / badge-building layer that sat at
 * 2 % statement coverage before this test file was added.
 */

// ---------------------------------------------------------------------------
// Inline copies of the pure helpers from dashboard.js
// ---------------------------------------------------------------------------

function sanitizeTagLabel(input) {
  if (!input) return '';
  return input.toLowerCase().replace(/[^a-z0-9]+/g, '-').replace(/-+/g, '-').replace(/^-|-$/g, '');
}

function tagMatchesUser(tag, username) {
  if (!tag || !username) return false;
  const tagLower = tag.toLowerCase();
  if (tagLower === username) return true;
  if (tagLower === sanitizeTagLabel(username)) return true;
  return false;
}

function getCoverArt(item) {
  if (!item || !item.images) return null;
  const poster = item.images.find(img => img.coverType === 'poster');
  if (poster) return poster.remoteUrl || poster.url || null;
  const fanart = item.images.find(img => img.coverType === 'fanart');
  return fanart ? (fanart.remoteUrl || fanart.url || null) : null;
}

function extractAllTags(tags, tagMap) {
  if (!tags || tags.length === 0) return [];
  if (tagMap) {
    return tags.map(id => tagMap.get(id)).filter(Boolean);
  }
  return tags.map(t => t && t.label).filter(Boolean);
}

function extractUserTag(tags, tagMap, username) {
  const allLabels = extractAllTags(tags, tagMap);
  if (!allLabels.length) return null;
  if (username) {
    const match = allLabels.find(label => tagMatchesUser(label, username));
    if (match) return match;
  }
  return null;
}

function getImportIssues(queueRecord) {
  if (!queueRecord) return null;
  const state = queueRecord.trackedDownloadState;
  const status = queueRecord.trackedDownloadStatus;
  if (state !== 'importPending' && status !== 'warning' && status !== 'error') return null;
  const messages = [];
  if (queueRecord.statusMessages && queueRecord.statusMessages.length > 0) {
    for (const sm of queueRecord.statusMessages) {
      if (sm.messages && sm.messages.length > 0) {
        messages.push(...sm.messages);
      } else if (sm.title) {
        messages.push(sm.title);
      }
    }
  }
  if (queueRecord.errorMessage) {
    messages.push(queueRecord.errorMessage);
  }
  if (messages.length === 0) return null;
  return messages;
}

function getSonarrLink(series) {
  if (!series || !series._instanceUrl || !series.titleSlug) return null;
  return `${series._instanceUrl}/series/${series.titleSlug}`;
}

function getRadarrLink(movie) {
  if (!movie || !movie._instanceUrl || !movie.titleSlug) return null;
  return `${movie._instanceUrl}/movie/${movie.titleSlug}`;
}

function canBlocklist(download, isAdmin) {
  if (isAdmin) return true;
  if (download.importIssues && download.importIssues.length > 0) return true;
  if (download.qbittorrent && download.addedOn && download.availability) {
    const oneHourAgo = Date.now() - 3600000;
    const addedOn = new Date(download.addedOn).getTime();
    const isOldEnough = addedOn < oneHourAgo;
    const availability = parseFloat(download.availability);
    const isLowAvailability = availability < 100;
    return isOldEnough && isLowAvailability;
  }
  return false;
}

function extractEpisode(record) {
  const ep = record.episode || {};
  const s = ep.seasonNumber != null ? ep.seasonNumber : record.seasonNumber;
  const e = ep.episodeNumber != null ? ep.episodeNumber : record.episodeNumber;
  if (s == null || e == null) return null;
  const title = ep.title || null;
  return { season: s, episode: e, title };
}

function gatherEpisodes(titleLower, sonarrRecords) {
  const episodes = [];
  const seen = new Set();
  for (const r of sonarrRecords) {
    const rTitle = (r.title || r.sourceTitle || '').toLowerCase();
    if (rTitle && (rTitle.includes(titleLower) || titleLower.includes(rTitle))) {
      const ep = extractEpisode(r);
      if (ep) {
        const key = `${ep.season}x${ep.episode}`;
        if (!seen.has(key)) {
          seen.add(key);
          episodes.push(ep);
        }
      }
    }
  }
  episodes.sort((a, b) => a.season - b.season || a.episode - b.episode);
  return episodes;
}

function buildTagBadges(allTags, embyUserMap) {
  return allTags.map(label => {
    const lower = label.toLowerCase();
    const sanitized = sanitizeTagLabel(label);
    const displayName = embyUserMap.get(lower) || embyUserMap.get(sanitized) || null;
    return { label, matchedUser: displayName };
  });
}

// ---------------------------------------------------------------------------
// Tests
// ---------------------------------------------------------------------------

describe('sanitizeTagLabel', () => {
  it('lowercases the input', () => {
    expect(sanitizeTagLabel('Alice')).toBe('alice');
  });

  it('replaces spaces with hyphens', () => {
    expect(sanitizeTagLabel('hello world')).toBe('hello-world');
  });

  it('replaces non-alphanumeric chars with hyphens', () => {
    expect(sanitizeTagLabel('user@example.com')).toBe('user-example-com');
  });

  it('collapses multiple non-alphanumeric chars to a single hyphen', () => {
    expect(sanitizeTagLabel('foo---bar')).toBe('foo-bar');
    expect(sanitizeTagLabel('foo   bar')).toBe('foo-bar');
  });

  it('trims leading and trailing hyphens', () => {
    expect(sanitizeTagLabel('-foo-')).toBe('foo');
  });

  it('returns empty string for falsy input', () => {
    expect(sanitizeTagLabel('')).toBe('');
    expect(sanitizeTagLabel(null)).toBe('');
    expect(sanitizeTagLabel(undefined)).toBe('');
  });
});

describe('tagMatchesUser', () => {
  it('matches exact username (case-insensitive)', () => {
    expect(tagMatchesUser('Alice', 'alice')).toBe(true);
    expect(tagMatchesUser('alice', 'alice')).toBe(true);
    expect(tagMatchesUser('ALICE', 'alice')).toBe(true);
  });

  it('matches when tag is the sanitized form of username', () => {
    expect(tagMatchesUser('user-example-com', 'user@example.com')).toBe(true);
  });

  it('does not match unrelated tags', () => {
    expect(tagMatchesUser('bob', 'alice')).toBe(false);
  });

  it('returns false for missing tag or username', () => {
    expect(tagMatchesUser('', 'alice')).toBe(false);
    expect(tagMatchesUser('alice', '')).toBe(false);
    expect(tagMatchesUser(null, 'alice')).toBe(false);
    expect(tagMatchesUser('alice', null)).toBe(false);
  });
});

describe('getCoverArt', () => {
  it('returns null when item is falsy', () => {
    expect(getCoverArt(null)).toBeNull();
    expect(getCoverArt(undefined)).toBeNull();
  });

  it('returns null when item has no images', () => {
    expect(getCoverArt({})).toBeNull();
    expect(getCoverArt({ images: [] })).toBeNull();
  });

  it('prefers remoteUrl from a poster image', () => {
    const item = { images: [{ coverType: 'poster', remoteUrl: 'https://img.test/poster.jpg', url: '/local.jpg' }] };
    expect(getCoverArt(item)).toBe('https://img.test/poster.jpg');
  });

  it('falls back to url when remoteUrl is absent on poster', () => {
    const item = { images: [{ coverType: 'poster', url: '/local.jpg' }] };
    expect(getCoverArt(item)).toBe('/local.jpg');
  });

  it('falls back to fanart when no poster exists', () => {
    const item = { images: [{ coverType: 'fanart', remoteUrl: 'https://img.test/fanart.jpg' }] };
    expect(getCoverArt(item)).toBe('https://img.test/fanart.jpg');
  });

  it('returns null when only irrelevant image types exist', () => {
    const item = { images: [{ coverType: 'banner', remoteUrl: 'https://img.test/banner.jpg' }] };
    expect(getCoverArt(item)).toBeNull();
  });
});

describe('extractAllTags', () => {
  it('returns empty array for null/empty tags', () => {
    expect(extractAllTags(null, null)).toEqual([]);
    expect(extractAllTags([], null)).toEqual([]);
  });

  it('resolves tag ids via tagMap (Radarr style)', () => {
    const tagMap = new Map([[1, 'alice'], [2, 'bob']]);
    expect(extractAllTags([1, 2], tagMap)).toEqual(['alice', 'bob']);
  });

  it('filters out ids not present in tagMap', () => {
    const tagMap = new Map([[1, 'alice']]);
    expect(extractAllTags([1, 99], tagMap)).toEqual(['alice']);
  });

  it('extracts label property when no tagMap (Sonarr object style)', () => {
    const tags = [{ label: 'alice' }, { label: 'bob' }];
    expect(extractAllTags(tags, null)).toEqual(['alice', 'bob']);
  });

  it('filters out tag objects without a label', () => {
    const tags = [{ label: 'alice' }, null, {}];
    expect(extractAllTags(tags, null)).toEqual(['alice']);
  });
});

describe('extractUserTag', () => {
  const tagMap = new Map([[1, 'alice'], [2, 'bob']]);

  it('returns the matched label when found', () => {
    expect(extractUserTag([1, 2], tagMap, 'alice')).toBe('alice');
  });

  it('returns null when no tag matches the username', () => {
    expect(extractUserTag([2], tagMap, 'alice')).toBeNull();
  });

  it('returns null when tags array is empty', () => {
    expect(extractUserTag([], tagMap, 'alice')).toBeNull();
  });

  it('matches via sanitized form (email-style username)', () => {
    const map = new Map([[1, 'user-example-com']]);
    expect(extractUserTag([1], map, 'user@example.com')).toBe('user-example-com');
  });
});

describe('getImportIssues', () => {
  it('returns null for null input', () => {
    expect(getImportIssues(null)).toBeNull();
  });

  it('returns null when state/status are benign', () => {
    expect(getImportIssues({ trackedDownloadState: 'downloading', trackedDownloadStatus: 'ok' })).toBeNull();
  });

  it('returns messages when state is importPending', () => {
    const record = {
      trackedDownloadState: 'importPending',
      trackedDownloadStatus: 'ok',
      statusMessages: [{ messages: ['Sample needs repack'] }]
    };
    expect(getImportIssues(record)).toEqual(['Sample needs repack']);
  });

  it('returns title fallback when statusMessage has no messages array', () => {
    const record = {
      trackedDownloadState: 'importPending',
      trackedDownloadStatus: 'ok',
      statusMessages: [{ title: 'No matching episodes' }]
    };
    expect(getImportIssues(record)).toEqual(['No matching episodes']);
  });

  it('includes errorMessage alongside statusMessages', () => {
    const record = {
      trackedDownloadState: 'importPending',
      trackedDownloadStatus: 'ok',
      statusMessages: [{ messages: ['Msg1'] }],
      errorMessage: 'Disk full'
    };
    expect(getImportIssues(record)).toEqual(['Msg1', 'Disk full']);
  });

  it('returns null when statusMessages is empty and no errorMessage', () => {
    const record = {
      trackedDownloadState: 'importPending',
      trackedDownloadStatus: 'ok',
      statusMessages: []
    };
    expect(getImportIssues(record)).toBeNull();
  });

  it('returns messages when trackedDownloadStatus is warning', () => {
    const record = {
      trackedDownloadState: 'downloading',
      trackedDownloadStatus: 'warning',
      errorMessage: 'Low disk space'
    };
    expect(getImportIssues(record)).toEqual(['Low disk space']);
  });

  it('returns messages when trackedDownloadStatus is error', () => {
    const record = {
      trackedDownloadState: 'downloading',
      trackedDownloadStatus: 'error',
      errorMessage: 'Cannot connect'
    };
    expect(getImportIssues(record)).toEqual(['Cannot connect']);
  });
});

describe('getSonarrLink', () => {
  it('returns null for falsy series', () => {
    expect(getSonarrLink(null)).toBeNull();
    expect(getSonarrLink({})).toBeNull();
  });

  it('returns null when _instanceUrl is missing', () => {
    expect(getSonarrLink({ titleSlug: 'my-show' })).toBeNull();
  });

  it('returns null when titleSlug is missing', () => {
    expect(getSonarrLink({ _instanceUrl: 'https://sonarr.test' })).toBeNull();
  });

  it('constructs the correct URL', () => {
    const series = { _instanceUrl: 'https://sonarr.test', titleSlug: 'breaking-bad' };
    expect(getSonarrLink(series)).toBe('https://sonarr.test/series/breaking-bad');
  });
});

describe('getRadarrLink', () => {
  it('returns null for falsy movie', () => {
    expect(getRadarrLink(null)).toBeNull();
  });

  it('constructs the correct URL', () => {
    const movie = { _instanceUrl: 'https://radarr.test', titleSlug: 'the-matrix-1999' };
    expect(getRadarrLink(movie)).toBe('https://radarr.test/movie/the-matrix-1999');
  });
});

describe('canBlocklist', () => {
  it('always returns true for admin', () => {
    expect(canBlocklist({}, true)).toBe(true);
  });

  it('returns true when download has importIssues', () => {
    expect(canBlocklist({ importIssues: ['issue'] }, false)).toBe(true);
  });

  it('returns false when importIssues is empty', () => {
    expect(canBlocklist({ importIssues: [] }, false)).toBe(false);
  });

  it('returns false when download is not a qbittorrent torrent', () => {
    expect(canBlocklist({ availability: '50' }, false)).toBe(false);
  });

  it('returns false for qbittorrent torrent that is too new', () => {
    const download = {
      qbittorrent: true,
      addedOn: new Date().toISOString(), // just added
      availability: '50'
    };
    expect(canBlocklist(download, false)).toBe(false);
  });

  it('returns false for old qbittorrent torrent with 100% availability', () => {
    const download = {
      qbittorrent: true,
      addedOn: new Date(Date.now() - 7200000).toISOString(), // 2 hours ago
      availability: '100'
    };
    expect(canBlocklist(download, false)).toBe(false);
  });

  it('returns true for old qbittorrent torrent with low availability', () => {
    const download = {
      qbittorrent: true,
      addedOn: new Date(Date.now() - 7200000).toISOString(), // 2 hours ago
      availability: '50'
    };
    expect(canBlocklist(download, false)).toBe(true);
  });
});

describe('extractEpisode', () => {
  it('returns null when season or episode is missing', () => {
    expect(extractEpisode({})).toBeNull();
    expect(extractEpisode({ episode: { seasonNumber: 1 } })).toBeNull();
  });

  it('extracts from nested episode object', () => {
    const record = { episode: { seasonNumber: 2, episodeNumber: 5, title: 'The One' } };
    expect(extractEpisode(record)).toEqual({ season: 2, episode: 5, title: 'The One' });
  });

  it('falls back to top-level seasonNumber/episodeNumber', () => {
    const record = { episode: {}, seasonNumber: 3, episodeNumber: 10 };
    expect(extractEpisode(record)).toEqual({ season: 3, episode: 10, title: null });
  });

  it('uses nested episode values over top-level when both present', () => {
    const record = { episode: { seasonNumber: 1, episodeNumber: 1, title: 'Nested' }, seasonNumber: 9, episodeNumber: 9 };
    expect(extractEpisode(record)).toEqual({ season: 1, episode: 1, title: 'Nested' });
  });
});

describe('gatherEpisodes', () => {
  const records = [
    { title: 'show.s01e01.720p', episode: { seasonNumber: 1, episodeNumber: 1, title: 'Pilot' } },
    { title: 'show.s01e02.720p', episode: { seasonNumber: 1, episodeNumber: 2, title: 'Episode 2' } },
    { title: 'other.show.s02e01.720p', episode: { seasonNumber: 2, episodeNumber: 1, title: 'Other' } }
  ];

  it('returns matching episodes sorted by season then episode', () => {
    const eps = gatherEpisodes('show.s01e01.720p', records);
    expect(eps.length).toBeGreaterThan(0);
    expect(eps[0].season).toBe(1);
    expect(eps[0].episode).toBe(1);
  });

  it('deduplicates identical season/episode pairs', () => {
    const dupeRecords = [
      { title: 'show.s01e01', episode: { seasonNumber: 1, episodeNumber: 1, title: 'Pilot' } },
      { title: 'show.s01e01', episode: { seasonNumber: 1, episodeNumber: 1, title: 'Pilot' } }
    ];
    const eps = gatherEpisodes('show.s01e01', dupeRecords);
    expect(eps.length).toBe(1);
  });

  it('returns empty array when no records match', () => {
    const eps = gatherEpisodes('completely different title', records);
    expect(eps).toEqual([]);
  });

  it('returns empty array for empty records', () => {
    expect(gatherEpisodes('anything', [])).toEqual([]);
  });
});

describe('buildTagBadges', () => {
  it('returns badge with matchedUser when tag resolves via lowercase key', () => {
    const embyUserMap = new Map([['alice', 'Alice']]);
    const badges = buildTagBadges(['alice'], embyUserMap);
    expect(badges).toEqual([{ label: 'alice', matchedUser: 'Alice' }]);
  });

  it('returns badge with matchedUser when tag resolves via sanitized key', () => {
    const embyUserMap = new Map([['user-example-com', 'User']]);
    const badges = buildTagBadges(['user@example.com'], embyUserMap);
    expect(badges).toEqual([{ label: 'user@example.com', matchedUser: 'User' }]);
  });

  it('returns matchedUser: null for unknown tags', () => {
    const embyUserMap = new Map();
    const badges = buildTagBadges(['unknown'], embyUserMap);
    expect(badges).toEqual([{ label: 'unknown', matchedUser: null }]);
  });

  it('handles empty tag list', () => {
    expect(buildTagBadges([], new Map())).toEqual([]);
  });
});